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For learners studying for CompTIA Network+ N10-009 (V9)
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Practice pack content
Domain 1 - Networking Concepts
Domain 2 – Network Implementation
Domain 3 – Network Operations
Domain 4 – Network Security
Domain 5 – Network Troubleshooting
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Try 3 Network+ N10-009 practice questions
Choose an answer, explore the explanation, and see why the other options are less suitable. Three short scenarios. No sign-in required.
1. Sizing an IPv4 subnet
A new office segment needs IPv4 addresses for 25 devices, including its gateway, from the private 192.168.40.0/24 block. The engineer wants the smallest conventional subnet that provides at least 25 usable host addresses. Which prefix should the engineer allocate?
Answer and full explanation
Correct answer: B — A /27 prefix with 30 usable addresses.
Why B is correct
A /27 leaves five bits for IPv4 host addresses, creating 32 total addresses in each subnet. In a conventional subnet, the network and broadcast addresses are not assignable to devices, leaving 30 usable addresses. That accommodates the stated 25 devices, including the gateway. A /27 is the smallest of these prefixes with enough usable addresses. For 192.168.40.0/27, the usable range is 192.168.40.1 through 192.168.40.30.
Why the other options are less suitable
- A — /28: Four host bits give 16 total addresses and only 14 usable addresses. This subnet could serve a smaller segment but cannot address 25 devices.
- C — /26: Six host bits provide 62 usable addresses, so the segment would fit. It allocates more addresses than necessary when the requirement is the smallest suitable subnet.
- D — /29: Three host bits provide eight total addresses and only six usable addresses. It cannot support the stated segment, though it could suit a much smaller one.
Key takeaway: Compare usable host capacity, not total addresses, when choosing the smallest IPv4 subnet.
Read two more sample questions
2. Planning nearby access point channels
Three nearby access points serve a small office on 2.4 GHz using 20 MHz channels. The administrator can select channels 1 through 11 and wants the three cells to avoid overlapping adjacent channels. Which channel set should be assigned?
Answer and full explanation
Correct answer: D — Channels 1, 6, and 11.
Why D is correct
The 2.4 GHz band has closely spaced channel center frequencies, so adjacent channel numbers overlap at 20 MHz widths. Channels 1, 6, and 11 are the standard non-overlapping set within the allowed 1-through-11 range. Assigning them to nearby access points avoids adjacent-channel overlap between those cells. The plan still needs a site survey and attention to interference from other nearby networks. A channel plan alone does not guarantee strong coverage or eliminate congestion.
Why the other options are less suitable
- A — Channels 1, 2, and 3: These center frequencies are too close for separate 20 MHz channels in the same area. They create substantial adjacent-channel overlap.
- B — Channels 1, 4, and 7: The three-channel spacing leaves overlap between neighboring 20 MHz channels. These channels might be available individually, but this set misses the separation requested.
- C — Channels 1, 5, and 9: Four-channel spacing still leaves overlap for this standard 20 MHz plan. This set is less suitable than 1, 6, and 11 for nearby cells.
Key takeaway: On a 2.4 GHz, 20 MHz plan with channels 1–11, use 1, 6, and 11 to avoid adjacent-channel overlap.
3. DHCP service for a new VLAN
Clients on a new VLAN receive self-assigned 169.254.x.x addresses instead of DHCP leases. The DHCP server is on another subnet, has free addresses in the correct scope, and the VLAN gateway can reach it. Which change is most likely to let those clients obtain addresses automatically?
Answer and full explanation
Correct answer: A — Configure a DHCP relay on the VLAN gateway.
Why A is correct
A client initially broadcasts to discover a DHCP server on its local network. A router does not ordinarily forward that broadcast into a different subnet. A DHCP relay on the new VLAN gateway forwards the request to the remote server and identifies the client's subnet for scope selection. The server already has available addresses in that scope, and the gateway can reach it, making relay the missing service in this scenario. After configuring relay, the administrator should verify that clients receive usable leases.
Why the other options are less suitable
- B — DNS forwarder: DNS forwarding sends name-resolution requests to another resolver. It does not relay a client's initial DHCP discovery to the remote DHCP server.
- C — Address translation: NAT changes source or destination addresses for routed traffic. It does not by itself carry a local DHCP broadcast to a server on another subnet.
- D — Another default route: A route could matter if the gateway had no path to the server. The scenario says the gateway can reach it, while the client's initial DHCP broadcast still needs a relay.
Key takeaway: A remote DHCP server needs a relay for client broadcasts from a different subnet.
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Requirements
- CompTIA recommends A+ certification and 9–12 months of hands-on experience in a junior network administrator or network support technician role. Familiarity with IPv4, switching, and wireless concepts will help with these scenarios.
- If you have gaps, use the N10-009 objectives and foundational networking study alongside question practice. Try your own subnetting, switch, wireless, and troubleshooting exercises to connect the answers to practical behavior.
- To use this ExamsDigest online practice product, you need an internet-connected device, a current web browser, and an ExamsDigest account.
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These details describe CompTIA’s official Network+ N10-009 exam.
What our students say
"The subnetting questions showed me where I was mixing up total and usable addresses. The explanations helped me decide what to review next."
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"Working through the wireless and network service scenarios helped me slow down and look for the detail that made one answer fit.”
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Your questions, answered.
Which Network+ exam version do these questions target?
Who is this practice suitable for?
It is suitable for learners working toward N10-009 who want to apply networking concepts to short decisions and troubleshoot their reasoning. CompTIA recommends A+ certification and 9–12 months of hands-on experience in a junior network administrator or network support technician role. That is a recommendation, not a requirement to use these practice questions. If subnetting, switching, or DHCP is unfamiliar, study those foundations as you practise.
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